I'm a bit scared to buy a grass machine with over 15Kv...
That's because of swedish law, which states that electrostatic hand tools over 20Kv is considered a handgun.... And will give you at least $3000 in fines or prison.
We have a prejudice, where a man rebuilt a fly zapper to give 35Kv to kill wasps.
Somehow the police found out about it, and he got 1 year on probation and $4000 in fines....